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INVESTMENT SECURITIES - Investments in debt securities at amortized cost (Details) - COP ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Disclosure of financial assets [line items]    
Financial assets $ 304,853,883 $ 280,746,878
Investment securities [member]    
Disclosure of financial assets [line items]    
Financial assets 39,162,618 34,425,693
Investment securities [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 39,181,293 34,442,575
Financial assets at amortised cost, category [member]    
Disclosure of financial assets [line items]    
Financial assets 251,981,889 236,970,165
Financial assets at amortised cost, category [member] | Investment securities [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 10,708,367 9,996,561
Debt securities [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 49,697,404 40,438,606
Debt securities [member] | Financial assets at amortised cost, category [member] | Investment securities [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 10,708,367 9,996,561
Debt securities [member] | Financial assets at amortised cost, category [member] | Investment securities [member] | Not later than one month [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 1,120,443 927,454
Debt securities [member] | Financial assets at amortised cost, category [member] | Investment securities [member] | Later than one month and not later than three months [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 30,655 26,515
Debt securities [member] | Financial assets at amortised cost, category [member] | Investment securities [member] | Later than three months and not later than one year [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 7,016,333 6,765,886
Debt securities [member] | Financial assets at amortised cost, category [member] | Investment securities [member] | Later than one year and not later than five years [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 136,318 151,217
Debt securities [member] | Financial assets at amortised cost, category [member] | Investment securities [member] | Later than five years and not later than ten years [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 68,447 2,098,299
Debt securities [member] | Financial assets at amortised cost, category [member] | Investment securities [member] | Later than ten years [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 2,336,171 27,190
Securities issued or secured by Colombian Government | Financial assets at amortised cost, category [member] | Investment securities [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 2,553,693 2,567,463
Securities issued or secured by other Colombian Government entities | Financial assets at amortised cost, category [member] | Investment securities [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 5,563,208 5,112,355
Securities issued or secured by foreign Governments | Financial assets at amortised cost, category [member] | Investment securities [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 30,655 26,515
Securities issued or secured by other financial entities | Financial assets at amortised cost, category [member] | Investment securities [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 2,350,549 2,082,993
Other debt securities | Financial assets at amortised cost, category [member] | Investment securities [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 64,709 63,825
Securities issued or secured by non-financial sector entities | Financial assets at amortised cost, category [member] | Investment securities [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets $ 145,553 $ 143,410